14 deg plus? for wot?
Thread Starter
Instructor
Joined: Jun 2004
Posts: 233
Likes: 0
From: algonac michigan
14 deg plus? for wot?
what is the stock mechanical full timing advance on a 76 HEI dist?
just put in my new comp cam XE 268 cam!!!!!!
hope it holds up.......its the one for the power band i want.
seems to like 14 deg initial advance.
R.
just put in my new comp cam XE 268 cam!!!!!!
hope it holds up.......its the one for the power band i want.
seems to like 14 deg initial advance.
R.
Melting Slicks
Joined: Oct 2001
Posts: 3,025
Likes: 12
From: Pleasant Grove AL
Don't be too concerned about the initial number. It is probably a combination of initial and some centrifugal anyway, unless you have the idle speed turned way down. What you want to check is to see that the TOTAL advance with vacuum disconnected runs in the 36-38* range. All the mechanical advance should be in by 3000 RPM. At cruise settings, the vacuum advance should kick in another 16 deg +/-.
Thread Starter
Instructor
Joined: Jun 2004
Posts: 233
Likes: 0
From: algonac michigan
im running an auto trans w/ 2500 stall
ive been told that you subtract stall speed from max power band rpm
5800-2500 = 3300
divide by 2
3300/2 = 1650
add to stall speed
2500+1650 = 4150rpm
this is where you want the full advance to come in.
any one else agree?
ive been told that you subtract stall speed from max power band rpm
5800-2500 = 3300
divide by 2
3300/2 = 1650
add to stall speed
2500+1650 = 4150rpm
this is where you want the full advance to come in.
any one else agree?
Tech Contributor
Joined: Aug 1999
Posts: 14,380
Likes: 6,390
From: At my Bar drinking and wrenching in Lafayette Colorado
You want to set up your distributor so you get 36 degrees total advance at 2500 rpm max. Tailor your curve so you can get about 16-18 degrees initial advance while maintaining the 36 total. Use a vacuum advance control unit that pulls in an additional 16 degrees.
Thread Starter
Instructor
Joined: Jun 2004
Posts: 233
Likes: 0
From: algonac michigan
thanks lars.
i just changed from an isky 2800-6500 oval track cam-(not my doing)
to the XE268 went for ride today getting hesitation below 2200 rpm
i did not before
before the cam swap i put on
edelbrock eps performer intake
edelbrock 600 performer carb
set HEI timing curve w/ spring kit (used lightest springs)
ran good but power was way on top.......
now seems to be lean surging.....w/ hesitation below 2200rpm
reset timing to 14 deg
reset idle mix drawing approx 13 in/mg at idle
i have a new 750 performer carb .......600 too small for new cam?
i just changed from an isky 2800-6500 oval track cam-(not my doing)
to the XE268 went for ride today getting hesitation below 2200 rpm
i did not before
before the cam swap i put on
edelbrock eps performer intake
edelbrock 600 performer carb
set HEI timing curve w/ spring kit (used lightest springs)
ran good but power was way on top.......
now seems to be lean surging.....w/ hesitation below 2200rpm
reset timing to 14 deg
reset idle mix drawing approx 13 in/mg at idle
i have a new 750 performer carb .......600 too small for new cam?
Last edited by 76REDSTINGER; Sep 19, 2004 at 03:57 PM.
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Thread Starter
Instructor
Joined: Jun 2004
Posts: 233
Likes: 0
From: algonac michigan
thanks
i was looking for the mechanical advance "allowed" w/ a stock
HEI dist
20 deg is optimal, most of the time, but ive heard that
you cant get that much from one
i just picked up a re-curve kit will play w/ that.
i was looking for the mechanical advance "allowed" w/ a stock
HEI dist
20 deg is optimal, most of the time, but ive heard that
you cant get that much from one
i just picked up a re-curve kit will play w/ that.
Melting Slicks
Joined: Apr 1999
Posts: 2,010
Likes: 3
From: Moon Twp. PA USA
Originally Posted by 76REDSTINGER
thanks
i was looking for the mechanical advance "allowed" w/ a stock
HEI dist
20 deg is optimal, most of the time, but ive heard that
you cant get that much from one
i just picked up a re-curve kit will play w/ that.
i was looking for the mechanical advance "allowed" w/ a stock
HEI dist
20 deg is optimal, most of the time, but ive heard that
you cant get that much from one
i just picked up a re-curve kit will play w/ that.
Thread Starter
Instructor
Joined: Jun 2004
Posts: 233
Likes: 0
From: algonac michigan
Originally Posted by 62fuelie
With an auto trans 2500 would be better. 3K would be an absolute max. On both my Vettes, (one conventional, one HEI), all the advance is in well before 2500.your low end should be good.
any compromise on the top end?